Orbit Fit and Astrometric record for 09DO143

The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.

# Object: 09DO143   
# Created Mon Oct 23 01:37:47 2017
# Orbit generated from Bernstein formalism
# Fitting   10 observations of   10
# Arc:  67.75d
# First observation: 2009/02/18
#  Last observation: 2009/04/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000002   0.020953  -0.000000  -0.001419   0.022620   0.000000
# Chi-squared of fit:     1.84 DOF:   14 RMS:  0.08
# Min/Max residuals:    -0.18    0.16
# Exact a, adot, b, bdot, g, gdot:
  1.428916E-05  2.064342E-02 -1.008538E-06 -1.416226E-03  2.252433E-02 -2.092450E-03
# Covariance matrix:
  2.9607E-13 -1.3139E-11  9.3451E-15  1.4636E-13 -9.3218E-13  2.9831E-10
 -1.3139E-11  4.0593E-08 -5.3002E-11 -7.4772E-10  6.7818E-09  7.1530E-10
  9.3451E-15 -5.3002E-11  2.9655E-13 -8.7443E-13 -8.9424E-12 -2.5325E-11
  1.4636E-13 -7.4772E-10 -8.7443E-13  5.6743E-11 -1.2594E-10 -2.9170E-10
 -9.3218E-13  6.7818E-09 -8.9424E-12 -1.2594E-10  1.1480E-09  4.4306E-09
  2.9831E-10  7.1530E-10 -2.5325E-11 -2.9170E-10  4.4306E-09  1.3480E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
   11.144692 -174.828536    0.574656    0.156472   -0.794228  2454881.106125
# Heliocentric elements and errors
Epoch:              2454880.5000  =  2009/02/18
Mean Anomaly:          263.97448 +/-    12.695
Argument of Peri:      218.02813 +/-    10.651
Long of Asc Node:       75.19033 +/-     0.169
Inclination:            11.57679 +/-     0.012
Eccentricity:         0.11796139 +/-    0.0515
Semi-Major Axis:     44.05720684 +/-    0.7519
Time of Perihelion: 2483371.5230 +/-    3695.3
Perihelion:          38.86015731 +/-    2.3643
Aphelion:            49.25425636 +/-    2.4200
Period (y)              292.4379 +/-      7.49
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.23746911 +/-    0.0653
Ecliptic Y           -3.43192275 +/-    0.0059
Ecliptic Z            8.58124149 +/-    0.0129
Ecliptic XDOT         0.00044690 +/-    0.0001
Ecliptic YDOT        -0.00247624 +/-    0.0000
Ecliptic ZDOT        -0.00021816 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.19258205 +/-    0.0639
Geocenter to KBO     44.39643572 +/-    0.0668
# Hcoef:  9.21

The following table shows the complete astrometric record for 09DO143. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (09DO143) followed by the observatory code and reference code for the source of the astrometry.

2009 02  18.605359 12 36 44.722  +08 10 22.18  24.4i 09DO143   568  C~0aRQ      
2009 02  18.642929 12 36 44.603  +08 10 23.31  24.7i 09DO143   568  C~0aRQ      
2009 02  22.558180 12 36 32.039  +08 12 18.68  25.7g 09DO143   568  C~0aRQ      
2009 02  22.614330 12 36 31.864  +08 12 20.40  26.0g 09DO143   568  C~0aRQ      
2009 02  23.506410 12 36 28.872  +08 12 46.80  25.9g 09DO143   568  C~0aRQ      
2009 02  23.561890 12 36 28.678  +08 12 48.50  25.4g 09DO143   568  C~0aRQ      
2009 02  23.617500 12 36 28.493  +08 12 49.94  26.3g 09DO143   568  C~0aRQ      
2009 03  25.428002 12 34 31.427  +08 27 21.13        09DO143   568  C~0aRQ      
2009 03  25.454983 12 34 31.308  +08 27 21.76        09DO143   568  C~0aRQ      
2009 04  27.354866 12 32 16.309  +08 39 02.00        09DO143   568  C~0aRQ      

The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.

  1   0.0000      0.00     0.04       0.00     0.00
  2   0.0001     -2.07     0.03       0.33     0.03
  3   0.0108   -219.19    -0.06      31.41     0.01
  4   0.0110   -222.26     0.13      31.95     0.16
  5   0.0134   -273.53    -0.07      38.37    -0.05
  6   0.0136   -276.85    -0.13      38.78    -0.02
  7   0.0137   -279.94     0.04      39.00    -0.18
  8   0.0953  -2220.84     0.00     143.53     0.08
  9   0.0954  -2222.71     0.02     143.41    -0.02
 10   0.1855  -4338.94    -0.00     -11.83    -0.02

The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.

09DO143    quality flag:1

Type:      CLASSICAL  SCATNEAR     5:3EE

axisobj        43.884    46.919    42.055
ecceobj         0.116     0.245     0.101
incobj         11.588    11.585    11.611
qmin           38.416    34.709    35.547
qmax           50.166    60.561    49.694
amean          44.147    47.241    42.328
amin           43.792    46.777    41.876
amax           44.540    47.922    42.842
emean           0.111     0.237     0.121
emin            0.097     0.207     0.077
emax            0.127     0.266     0.160
imean           9.782     8.698     9.216
imin            9.152     7.498     7.641
imax           10.409    10.452    10.653
excite_mean     0.203     0.282     0.201
fracstop        1.000     1.000     1.000
cjmean          3.054     3.043     3.034

libcent 0      -180.0    -180.0     181.3
libamp  0      -180.0    -180.0     142.5
libcent 1      -180.0    -180.0    -180.0
libamp  1      -180.0    -180.0    -180.0
libcent 2      -180.0    -180.0    -180.0
libamp  2      -180.0    -180.0    -180.0
libcent 3      -180.0    -180.0    -180.0
libamp  3      -180.0    -180.0    -180.0
libcent 4      -180.0    -180.0    -180.0
libamp  4      -180.0    -180.0    -180.0

kozaimean       182.6     186.2     272.8
kozaiamp        180.0     180.0      43.2